Nevada Exploration Inc. announced that the results of a mercury soil sampling program combined with the results of its earlier hydrogeochemistry (groundwater) sampling program have extended the geochemistry support for its NNW-trending target at South Grass Valley another 1,500 metres beyond the 2,500 meters established based on the results of its ongoing drilling program, for a total of 4,000 metres, which still remains open. Mercury is one of the characteristic pathfinder elements associated with Carlin-type gold deposits (CTGDs): thallium, antimony, mercury, and arsenic. As the most volatile of the CTGD pathfinders, mercury is the most easily transported vertically, in vapour phase. Because of its vertical mobility and strong association with CTGDs, testing for mercury in soils to detect covered CTGD mineralization is a logical tool for focusing exploration efforts at covered targets. As part of a deposit case study at the Cortez Hills deposit at the north of end of Grass Valley, soil sampling demonstrated that mercury concentrations in soil increase immediately above the footprint of gold mineralization.